Dr. Katrina Armstrong told a federal task force she could not remember details from the university’s report on antisemitism or her response to its recommendations.

The chief justice, acting on his own, issued an “administrative stay,” a brief pause meant to give the court time to consider the matter. The justices are expected to act in the coming days.

A brutal day for markets around the world added to the pain of last week’s turmoil. The S&P 500 ended nearly 18 percent below its February peak on Monday.